{ "cells": [ { "cell_type": "markdown", "metadata": {}, "source": [ "# GeoViews\n", "\n", "Mit [GeoViews](https://geoviews.org/) lassen sich geografische, meteorologische und ozeanografische Datensätze leicht erkunden und visualisieren. GeoViews basiert auf [HoloViews](https://holoviews.org/) und ergänzt deren Visualisierung multidimensionaler Daten um geografischen Plot-Typen, die auf [Cartopy](../../../matplotlib/cartopy/index.rst) basieren." ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "## Installation\n", "\n", "Wenn [Cartopy](../../../matplotlib/cartopy/install.rst) bereits installiert ist, kann GeoViews mit pipenv installiert werden:\n", "\n", "``` bash\n", "$ pipenv install geoviews\n", "```" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "## Beispiele\n", "\n", "GeoViews arbeitet gut mit Iris- und xarray-Bibliotheken für mehrdimensionale Arrays zusammen, wie sie in netCDF-Dateien gespeichert sind. GeoViews akzeptiert jedoch auch Daten als NumPy-Arrays und Pandas-Datenrahmen. In jedem Fall können die Daten in ihrem ursprünglichen, nativen Format gespeichert und in ein HoloViews- oder GeoViews-Objekt verpackt werden, das interaktive Visualisierungen ermöglicht." ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "### xarray-Beispiel\n", "\n", "Für das folgende Beispiel benötigen wir ebenfalls noch [xarray](http://xarray.pydata.org/en/stable/). Es kann mit Spack installiert werden mit:\n", "\n", "``` bash\n", "$ spack install py-xarray\n", "```" ] }, { "cell_type": "code", "execution_count": 1, "metadata": {}, "outputs": [ { "data": { "application/javascript": [ "(function(root) {\n", " function now() {\n", " return new Date();\n", " }\n", "\n", " var force = true;\n", " var py_version = '3.1.1'.replace('rc', '-rc.').replace('.dev', '-dev.');\n", " var is_dev = py_version.indexOf(\"+\") !== -1 || py_version.indexOf(\"-\") !== -1;\n", " var reloading = false;\n", " var Bokeh = root.Bokeh;\n", " var bokeh_loaded = Bokeh != null && (Bokeh.version === py_version || (Bokeh.versions !== undefined && Bokeh.versions.has(py_version)));\n", "\n", " if (typeof (root._bokeh_timeout) === \"undefined\" || force) {\n", " root._bokeh_timeout = Date.now() + 5000;\n", " root._bokeh_failed_load = false;\n", " }\n", "\n", " function run_callbacks() {\n", " try {\n", " root._bokeh_onload_callbacks.forEach(function(callback) {\n", " if (callback 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\n", "" ], "text/plain": [ ":Layout\n", " .Ocean.I :Feature [Longitude,Latitude]\n", " .Land.I :Feature [Longitude,Latitude]\n", " .Overlay.I :Overlay\n", " .Ocean.I :Feature [Longitude,Latitude]\n", " .Land.I :Feature [Longitude,Latitude]\n", " .Coastline.I :Feature [Longitude,Latitude]\n", " .Borders.I :Feature [Longitude,Latitude]" ] }, "execution_count": 2, "metadata": { "application/vnd.holoviews_exec.v0+json": { "id": "p1005" } }, "output_type": "execute_result" } ], "source": [ "(gf.ocean + gf.land + gf.ocean * gf.land * gf.coastline * gf.borders).opts(\n", " \"Feature\", projection=crs.Geostationary(), global_extent=True, height=325\n", ").cols(3)" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "Als Beispieldaten verwenden wir [geoviews-sample-data.zip](http://assets.holoviews.org/geoviews-sample-data.zip) und entpacken es als `data`-Verzeichnis." ] }, { "cell_type": "code", "execution_count": 3, "metadata": {}, "outputs": [ { "name": "stdout", "output_type": "stream", "text": [ " % Total % Received % Xferd Average Speed Time Time Time Current\n", " Dload Upload Total Spent Left Speed\n", "100 6246k 100 6246k 0 0 5679k 0 0:00:01 0:00:01 --:--:-- 5694k\n", "Archive: geoviews-sample-data.zip\n", " inflating: ensemble.nc \n", " inflating: ensembles.nc \n", " inflating: pre-industrial.nc \n" ] } ], "source": [ "!curl http://assets.holoviews.org/geoviews-sample-data.zip --output geoviews-sample-data.zip\n", "!unzip geoviews-sample-data.zip" ] }, { "cell_type": "code", "execution_count": 4, "metadata": {}, "outputs": [], "source": [ "dataset = gv.Dataset(xr.open_dataset(\"./ensemble.nc\"))\n", "ensemble = dataset.to(\n", " gv.Image, [\"longitude\", \"latitude\"], \"surface_temperature\"\n", ")\n", "\n", "gv.output(\n", " ensemble.opts(\n", " cmap=\"viridis\", colorbar=True, fig_size=200, backend=\"matplotlib\"\n", " )\n", " * gf.coastline(),\n", " backend=\"matplotlib\",\n", ")" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "### GeoPandas-Beispiel\n", "\n", "GeoViews unterstützt auch nativ [GeoPandas](../../../matplotlib/geopandas/index.rst)-Datenstrukturen, so dass wir shapefiles und Choropleth einfach darstellen können:" ] }, { "cell_type": "code", "execution_count": 4, "metadata": {}, "outputs": [ { "name": "stderr", "output_type": "stream", "text": [ "/tmp/ipykernel_88986/2104909695.py:5: FutureWarning: The geopandas.dataset module is deprecated and will be removed in GeoPandas 1.0. You can get the original 'naturalearth_lowres' data from https://www.naturalearthdata.com/downloads/110m-cultural-vectors/.\n", " gpd.read_file(gpd.datasets.get_path(\"naturalearth_lowres\")),\n" ] }, { "data": {}, "metadata": {}, "output_type": "display_data" }, { "data": { "application/vnd.holoviews_exec.v0+json": "", "text/html": [ "
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\n", "" ], "text/plain": [ ":Polygons [Longitude,Latitude] (pop_est,name)" ] }, "execution_count": 4, "metadata": { "application/vnd.holoviews_exec.v0+json": { "id": "p2754" } }, "output_type": "execute_result" } ], "source": [ "import geopandas as gpd\n", "\n", "\n", "gv.Polygons(\n", " gpd.read_file(gpd.datasets.get_path(\"naturalearth_lowres\")),\n", " vdims=[\"pop_est\", (\"name\", \"Country\")],\n", ").opts(tools=[\"hover\"], width=600, projection=crs.Robinson())" ] } ], "metadata": { "kernelspec": { "display_name": "Python 3.11 Kernel", "language": "python", "name": "python311" }, "language_info": { "codemirror_mode": { "name": "ipython", "version": 3 }, "file_extension": ".py", "mimetype": "text/x-python", "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", "version": "3.11.4" }, "latex_envs": { "LaTeX_envs_menu_present": true, "autoclose": false, "autocomplete": true, "bibliofile": "biblio.bib", "cite_by": "apalike", "current_citInitial": 1, "eqLabelWithNumbers": true, "eqNumInitial": 1, "hotkeys": { "equation": "Ctrl-E", "itemize": "Ctrl-I" }, "labels_anchors": false, "latex_user_defs": false, "report_style_numbering": false, "user_envs_cfg": false }, "widgets": { "state": {}, "version": "1.1.2" } }, "nbformat": 4, "nbformat_minor": 4 }